Description One of the largest species of Myotis in North America, with fur varying from light brown to almost black. Has a stubby-nosed appearance, with the ears barely reaching to the end of the nose when bent forward. Forearm 40-45mm.

Dimensions 83-102mm, 39-47mm, 9-14g

Warning Bats are susceptible to rabies, a serious viral disease that results in death if untreated. Rabid bats rarely attack humans or other animals, but bats found lying on the ground may be rabid. Never touch or pick up any bat. Stay away from any animal that seems to be acting strangely and report it to animal-control officers. If you are bitten by a possibly rabid animal, you must immediately consult a doctor for a series of injections; there is no cure once symptoms emerge.

Habitat Cities, suburbs & towns, Canyons & caves

Range Plains, Southwest, Texas, California

Discussion In some caves containing large numbers of these bats the humidity is very high and the ammonia content of the air from the batsí urine can cause the pelage to bleach to a paler color. Flies stronger and less erratically when foraging than most other species of Myotis. Feeds on moths and beetles, and is most active just after dusk and just before dawn. Forms large colonies in caves in lowlands of southwestern North America. Some of these are year-round residents hibernating in the caves during the winter. Other individuals migrate south for the winter, and some may actually seek colder caves at higher elevations for more efficient hibernation.